Thermostat for electric heating and cooking apparatus.



R. J. M. PARKE 5L E.-D. BRAND.

THERMOSTAT FOR ELECTRIC HEATING AND COOKING APPARATUS. APPLICATION HLED 050.19, 1-913,

' 15211994. 7 Paiented Mare 6, 19H.

2 SHEETS -SHEE? 1%. T TY,

R. J. M. PARKE & E. 0. BRAND. THERMOSTAT FOR ELECTRIC HEATING AND COOKING APPARATUS.

I APPLICATION FILED DECI l9, I913. 1,217,994.

Patented Mar. 6, 1917.

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WMWWW E EKG/M v UNITED STATES PATENT OFFICE.

RODERICK J. M. PARKE AND ETJWARD D. BRAND. 0F TORGNTO, ONTARIO, CANADA.

THERMOSTAT FOB ELECTElIG HEATIEE'G- AND CGOKING APPARATUS.

To all whom if may cancer-1i Be it known that we, RODERICK JosnPi-r MACDONALD PARKE and Enwiiao DAVID BRAND, of the city of Toronto, Province of Ontario, Canada, have invented. certain new and useful Improvements in Thermostats for Electric Heating and Cooking Apparatus, of which the following is a specification.

This invention relates to thermostatic apparatus such as disclosed in United States Letters Patent No. 987161 dated March 21, 1911, and Canadian Letters Patent No. 127074 dated July 26, 19l0,'and our object is to devise apparatus of this type which will be reliable, easily calibrated aiid easily set. We attain our object by means of the constructions hereinafter described and illustrated in the accompanying drawings in which" Figure 1 is a front elevation of our im proved apparatus;

r'Fig. 2 is a front elevation with the dial and hand removed;

Fig. 3 a front elevation illustrating particularly the rocking frame and means for actuating the driven rock shaft from the thermostatic element; and

Fig. 4 is a. vertical cross section of the device partly in elevation.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

The thermostatic element may be of any ordinary type, though we show a form in which a tube 1 containing mercury is connected with a coilcd llourdon tube 2 usually filled with a The end of this coiled tube moves to one side or the other on an arc of a circle according to the pressure in the tube 2 due to the expansion or contraction of the mercury. This movement is used to actuate the apparatus in the following manner and by the following means:-

- A frame 3 is pivoted at 4 on the casing: 5

of the apparatus. This frame at its upper end is provided with the lug 6 with which Specification of Letters Patent.

Application tiled Bccemner 19, 1813.

Patented Mar. 6, 1917.

Serial No. 807,690.

is engaged the screw l passing: loosely through the lug so as to be rotatable therein and held from lengthw'se lllUVGll'lQl'lt by the collars 8 suitably hold in place on the screw.

.This screw is threaded throuuh the casin 7. h

as indicated and its outer end is squared for engagement with a box wrench. by means of which the screw may be rotated to rock the frame 3. Preferably the lug: is a separate piece from the frame and secured thereto by means of rivets. On the adjustable Fri-mic 3 is journaled the driving rock shaft 10. to which is secured the gear segment 11.. This gear segment is connected with the coiled tube 2 of the thern'iostatic element by means of the link 12, pivotally connected to the end of the tube '2 and adjustably and pivotally connected with the gear segment ll, the pivot pin '13 being udjustahly secured in a radial slotli in the g-gear segment in any well known iminner. This adjustable connection enables the extent of movement ot the gear segment relative to the thermostatic e cment to be adjusted. This gear segment meshes with the pinion 15 secured to thedrivcn rock shaft 16. ii rocking,- arm 17 preferably yolic shaped and Formed of non-conducting material. is journalcd concentric with this rock shaft. being secured to the gear wheel 18. This rocking arm angularlv adjustable by means of the gearing' 19 meshing" with the gear wheel l8, actuated by the spindle Z0 journaled in the casing and provided with the milled hand wheel 21 outside the casing below the dial .22. This rocking arm 17 carries the con-- tacts 23 and 2%,prelerably formed as screws adjustable in the arm. 25 is a spring; finger clamped between the upper ends of the yoke shaped arm 17 by means of the screw 26. This spring finger normally contacts with the contact 23. A projection 27 formed on a. collar 28 secured to the rock shaft 16 is adapted to engage the finger 25 to force it into contact with the contact 24 as the tube 2 expands under the action of heat and actuates the gear segment ll. The end of the ie ts 5 mg the rock-- end 1y adjusting the rockmg 65 y yleldingly mm :0 arm we when Contact a-Led in said t seem-ed thereto liOIl secured V a pair of cent-ac at Contact fing arm adapted to Contact ent; a rocking n/en rock shaft :t and normttl t tewart't the 5663116 gourn uleresmd gem segurntied cmieentr it i the second Contact edju ztie elem 1; it! .zne;

ah the arm 3' ha met: 11;}; arm hv Sitid rock with one 0 means e ii in the mes a he

means the pm the arm the t m erature index 530 is SGCl-WGL serves to indicate device .1

Mad 2 3 .2 ined in e siti Q ta

moves ever dial V ture to which the tne'l'mestetie eiemen posed.

15 scaie mtu'ke mutate is; ."tiii k Wheree cesng end;

; e roe shaft led concentric with the d by sai carried by the rock he contact ing a rockriviw rock shaft journaled piveev

evices Carrie ,ostetie element one end on the flatmates stud 1'00 ,ulerly adjust actjustable the semi Wear the letter wctuete the D Q C a ing th e eppemtus, the 0mm ilil tlC element o the thermostatic ele- .ntect d L to means :ter an segment secured theree tmd' 1th yearn onteet T mi e ".1119 tez 1 theximo in"; mine 3 see: fvmne; 011; e v1m and he Ier 'th ltlees on the di uni.

g 21pm 1 USMHEY! t e mi are 1. t". L t-J the 526M131 wez'mest:

the '3 nd tie: mtus thseclesmt m. th 1 in engages t unget is moved the spun 1 inte el'tgn 'ein he g'e e we ms'tzmou. embies me te up etus en that agrees e, pprox: "1n ate? v described and t wen] and The net jectim Demtm'e to segment 21 the frame i nesh mg ter; a

sent 1 Y e 1 iv' 120 ement and. ham

, a. pin- Med 111;; resizing; arm j0urshaft; 00 "3m; e centact aft and adapted to! 3 means for ing arm; i

casing; it thez'mestatie e1e-115 ,e niveted adjacent one end egiezg; theces' eat; the let ed it. .z'eme eeiretog ink p e pit teci connec t; driven e Heme "with the efeie i235 teeming-3' etsmjoumai 4 the areal 37 said ck s11 ctevices the rock aermestatic apparatus, the camjournal secured t tic e justebl .fg ee t' egggmen ".le 2: a

ting

ermeste '13 carried tetue'te tn centect t tt enguleriy ertjus ambit: 1 he a ermed fine e a tns he (I etc-1 trifle jeuz" mitt er .HwuCtS eentec met me up Stine; 0"

mstatie Z'LEJYMH" they 21 met: st

x g'mset mme z'nngemen tea i 1011 0i it me; ezms we 69 Contact an concentric with the rock shaft; contact devices carried by said arm; a Contact arm. carried by the rock shaft and adapted to actuate the Contact devices; and means for angnlai'iy adjusting the rocking arm.

(3. In a thermostatic apparatus the combination of a yoke shaped rocking arm of nonconducting material; a contact finger clamped at one end between the parts of the arm; contacts *ai'ried by the parts of the arm between which said finger may play;

a shaft from which said arm is supported; a projection on said shaft adapted. to engage the finger; and a thermostatic element adapted to rock the shaft. 15 Toronto this 14th day of Nov. A. D. 1913.

RODERICK J. M. PARKE. EDsVARD D. BRAND.

Signed in the presence of- J. Emv. MAYBEE, GEO. P. Mannie. 

